As a person who loves villains I think part of the reason I hate Venat is that she could have been such a good villain if they just presented her as such.
A convocation member that thought she was to important to die. As arrogant as Zenos.
Would rather the Ancients that sacrificed themselves remain trapped in Zodiark forever. (A spiteful jab at Emet to keep him separated from Hythlodeus as well as forcing more people to rely on her)
Permanently killing her followers to godhood without ever telling them why.

Add some maniacal laughter and she could have been my favorite villain of all time.

But the sanctimonious hypocrisy of it all just ruins it.